Insulated joint.



G. WRIGHT.

INSULATED JOINT.

APPLICATION FILED F332, 1910,

Patented July 12, 191.0.

Witnsses:

UNITED -sTATEs PATENT onirica.

GILBERT WRIGHT, or SCHENECTADY, NEW YORK, ASSIGNUB. T0 GENERAL ELECTRIC COMPANY, .a oonroRATIoN or New Yomr.

I-NSULATED JOINT.

` speeiaeenen of Letters einem.

Yatented July 12, i919.

Appueauen'med February 2,4910. seriaine. 541,483.

.b all whom #may concern: v

Be it known that I, GILBERT WRIGHT, a.

citizen of the United States, residingA at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Insulated Joints, of which the following is a specification. This invention relates to joints for insulating gas pipes and electricl fixtures. Such joints usually comprise two threaded nipples each adapted to be screwed upon the end of a section of the gas pipe or other conduit in which the joint is located. The nipples are suitably secured together, but are separated by interposed insulating material to preventthe flow of an electric current from one pipe section to the other. j

In my improved joint I provide each nipple with a polygonal flange, and one or both of them have projecting lobes which can be folded around the edge of the other nipple to fasten them together. The sheet of insulating material projects beyond the edges of the Hanges and lobes sothat it will be folded in with the lobes when they are turned down.

In the accompanying drawing, Figure l is a longitudinal section of an insulating joint embodying 1 y invention; ig. 2 is a top plan view, with the inclosing insulating compound in section; Fig. 3 `1s a plan ofthe joint before the lobes are folded ldown; Fig.

. 4 is a longitudinal section of a w modified form of my joint; Fig. 5 is a plan View, with the inclosing ihsulating compound in section; Fig. 6 is afpl'an of the insulating diaphragm; Fig. 7 isi an end view of the upper nipple; and FigIB an'end view of the lower nipple.

Referring first to Figs. 1, 2 and 8, it will be noted that the upper nipple 1 has a square flange 2. This 1s the preferred shape, though any polygonal The flange of the lower nipple 3 corresponds in shape with that of the upper nipple, and from'each of its sides projects a lobe 4, having preferably a semicircular outline. The interposed sheet 5 of insulating material, such as mica, is similar in shape to the flange and lobes of the lower nipple, but somewhat larger, so lthat its lobes 6 extend beyond the Y lobes et. When the square form of flange is used, the insulating the conduit'is to carry suitable dies,

upon theflange 2 and the interposed mica,

-the insulating sheet form may be used.A

vided with projecting gas or electric conductors, then sheet 5 is .providedwith -a perforation 7 in line with the nipples. To'secure the two nipples together, the lobes 4 are turned up, inwardly and down upon the flange 2 of the upper nipple, carrymg with them the lobes 6 of the mica sheet 5.

which press lthe lobes 4 firmly as shown in Figs. l and 2; the edges of' the lobes 6 extending up between the tips of the lobes 4i and the. nipple l, so as to eifectually insulate them. The parts are then enveloped 1n a mass of insulating com ound 8, which ismolded in place. This orms a strong, compact and serviceable joint, the polygonal form of the flanges preventing one nipple from turning on the other when the joint is being screwed into place.

In the modiiation shown in Figs. l to 8, eachv nipple has an approximately square flange with two lobes 9 projecting from opposite sides thereof, and the insulating sheet l0 is a quarterfoil. The two nipples are assembled with the lobes of one standing at right angles to those of the other, so that when those on the'lower nippleare turned up, those on the upper nipple can be simiand thus the parts are larly turned down, doubly interlocked. Two of the lobes ll of l0 are folded up and the other two are turned down with their corresponding lobes 9, as indicated in Fig. 5. Molded insulation l2 is applied to the joint after the lobes are interlocked. This form of joint is especially strong to resist torsional strains. If the pipes are not to serve as a conduit, the insulating sheet may be simply an unperforated diaphragm, as shown in Fig. 4.

What I claim as new and desire to secure by Letters Patent of the United States, Isa* l. lAn insulating joint comprising two nipples each having a interposed sheet of insulating material having projecting lobes corresponding with the sides of said flanges, and lobes on a flange adapted yto be turned over upon the other flange and upon the corresponding lobes of said insulating sheet.. I

2. Any insulating' joint comprising two nipples each h'auinr' a polygonal flange prolobes, andan inter- This operation is effected by polygonal flange, an

posed lobed sheet of insulating material held between the flange of one nipple and the folded-over lobes of the other.

3. An insulating joint comprising tWo nipples having square flanges, an interposed quarterfoil sheet of insulating material, and lobes on a flange folded over upon the other flange and upon the corresponding lobes' of the insulating sheet. f

4. An insulating joint comprising tWonipples having square lanves provided With lobes on opposite sides, the lobes on each flange being folded down upon the other flange, and insulating material interposed between said flanges and under said lobes. 

